From 8acbc2a8865ca74f0f80c51c6511b9ab4c03d552 Mon Sep 17 00:00:00 2001 From: Stefan Reinauer Date: Thu, 17 Nov 2011 13:03:38 -0800 Subject: [PATCH] use movsl for copying resume memory back It's not significantly faster, but easier to read and smaller. Change-Id: Ibab0b478873912d67bf1f07743f628586353368a Signed-off-by: Stefan Reinauer Reviewed-on: http://review.coreboot.org/755 Reviewed-by: Mathias Krause Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich --- src/arch/x86/boot/wakeup.S | 23 ++++++----------------- 1 file changed, 6 insertions(+), 17 deletions(-) diff --git a/src/arch/x86/boot/wakeup.S b/src/arch/x86/boot/wakeup.S index a1df4d559..8ae337ca5 100644 --- a/src/arch/x86/boot/wakeup.S +++ b/src/arch/x86/boot/wakeup.S @@ -38,23 +38,12 @@ __wakeup: movw %ax, (__wakeup_segment) /* Then overwrite coreboot with our backed up memory */ - movl 8(%esp), %esi - movl 12(%esp), %edi - movl 16(%esp), %ecx - shrl $4, %ecx -1: - movl 0(%esi),%eax - movl 4(%esi),%edx - movl 8(%esi),%ebx - movl 12(%esi),%ebp - addl $16,%esi - subl $1,%ecx - movl %eax,0(%edi) - movl %edx,4(%edi) - movl %ebx,8(%edi) - movl %ebp,12(%edi) - leal 16(%edi),%edi - jne 1b + cld + movl 8(%esp), %esi + movl 12(%esp), %edi + movl 16(%esp), %ecx + shrl $2, %ecx + rep movsl /* Activate the right segment descriptor real mode. */ ljmp $0x28, $RELOCATED(1f) -- 2.25.1